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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6f2f0726da71e94a17cd082a279c4d88a1637179fd8248566539947a6fb3a8e' 
  AND token = 'T0eDGnHoioXoztGHXrNXYDELHkFvliw3KoUbOQlnX8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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