SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '644197580344510acc7d6a7508c1d2e671c0ef43cca717acad81e995f14a9d13' 
  AND token = 'ytl/Uef8tyJaV4SpB7PAbz2k7q8TZgDGCRZIuG/3e+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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