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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '542864314ba8be97e0290da5009a83b3164fab6d73ad0784a9736dcb7cbd7ce7' 
  AND token = 'ANVrFAR+pApgD+tIBXjEQLgMu1cYx+No6sJ4072nLs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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