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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75a8903a87cb1f210b50886016498400a3ad0bd226796ff2267cefd9b2024aa3' 
  AND token = 'Hoa2RH21yyC+p+cLnR18/yMDUTxUj1B00YrZsnAtzmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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