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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7bc2d81900aa26232748874b4b05fbe12cf6d478ffda92022544f8971ea377a6' 
  AND token = 'X3UEL6o1jweuk+0+LksKsLFvrGI1jYDfnsvQ3Vd0e30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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