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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b9630c5d778dcff80bc6a33f7e22dc695b9fd6c56ada1965278785372982531' 
  AND token = 'pqvmkMEEARosf3BXNyODfYneqB6g2GikAEa/ouxH6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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