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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25ab201d0dd5021ce91b42159d32d3550efacdc2b7143b063f04ad27ff4f05f4' 
  AND token = 'vcJz3+eBLhK8eH5ZYkP6787Y+OcXmO74P11ULmUAcH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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