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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b1cae26aad87787717737816d0c2788e11e8951febd6d6dc6e16bdba3e2cc12' 
  AND token = 'iCuI10y/wqLsCSyb+l9hgLlU4/LRyVfIG85D5Kv2qd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}