SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ead7b709b01165afaf45f1ab2fe673f8508f6baad1b15b4138d75544500c1f0' 
  AND token = 'xaFCvEGW8svB0dOFHL+XRn94q8Y9z2z3N4BKN4JRBj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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