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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '665d595caa856201b34eb9cbc2dea35bd0f43aa1909a93c8b7998f2d247599db' 
  AND token = '7FpeBmuaPukaQKRn8eWSHBxt7vLpm1P2VWvnuKH5rOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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