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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '744a39355e3de3a2a82bebc495a745b118619b4f3328ad7efcffa3d97d4caa72' 
  AND token = 'QIT7AGX8x6EarLGePiKS4csq0aey1c7TniDckaxsnW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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