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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a6972846f6c45d6861147838d6532370ecae135fe97751f2551c398541bfbea' 
  AND token = 'c7aRaiI8x5wINMcEy9nxrKlUJBi6puWD+L224Pd0sgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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