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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3238f0ed2f94709f376083830120b2bcce365ca31c5d2a7f837ce32cefca2d07' 
  AND token = 'xUNfvv9+Mbkvp9oG9l2Fwdvhpp0MEyVM/+NOM/qLNVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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