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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e6fcd66b8267d8d85c50d242ffa010af674a36740aaeaaab49cdd0f92c36a27' 
  AND token = 'dIa45auaM1vPxFKZGLaON+R0cEqSdHJ664x1fG2gjL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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