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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03fbc322d12448983811616d5ee4df7cf58b99eb12a1b2337e65ad7bac75a7c2' 
  AND token = 'PX2mak1GtpF/NIuIAynh2b+trWzohP2nn/GvIcEcJdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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