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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8b29efbf2f3f38c4758504b9fe93bab51b4bfeacb61ff454e9829bc950c3e9b' 
  AND token = 'CtwUPfS1tLI/Yv8BOAXnSfTEc0dCKxdf9jPhqvTq1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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