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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25478a1ca9c17bc4bfd5985f00d244941a57eec8694fd227241ce892fb165d9f' 
  AND token = 'kUe76PeXG+wdz6g99ta6EZQ417fihMEnaoj8KNrK0yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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