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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba8d6616e615257fc450a69ff63f12cb94384de2455d64d35eb2145cb6effc6e' 
  AND token = 'qKr3v0pf7oyeB/1Y5WkMpmOvLsxY5VnCgGSRLkXtbtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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