SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '258d7b48fa202ebd28bfa4d466eeb152b710154644083f084a5e991e0ae433a3' 
  AND token = 'oJHPBFdga7VrcBu2Q/OWT+u3qE0X3Px0D4X1wVNX9vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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