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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa19ed5efa14f1b080a6346de4a0ca4f35c54179a515b96d4997bd26d74ccb0e' 
  AND token = 'slP/CrURZu5/B73EhyL++0/A9FE79Hp+R8r0itDETg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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