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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b0e1b012a8a76102b344f4c5084ce68f0e05f0ac11db9b7f42ff87242eec2491' 
  AND token = 'umHojiFIynxxSkFFMnoXQM9tZ6Mdo9HOf+iuU9jKPKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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