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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83073d20290e2c7cfecc9e734e9877aaec02a085a264fecf3d8681986abee18b' 
  AND token = '85q9PVihL2yJ0ZekBVCfJ3ktVnnsf40+3d+bcplBQdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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