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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66644bcfa061c61abfd318769d71bf60489c7df62b0a494d088131c901f3c4f2' 
  AND token = '0JLocTa+qySzk5CCchqFV0o83CNt/9+nFexuecPh0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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