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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bcd4484f1ad84dea7a023cd25ee9031291ba7eef77cc39a50b229c6ea56fdc11' 
  AND token = 'CO8VQEeL4jhEPDrmgkoqwQhf9rDMgm3rO60pMB2LW2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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