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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35ba2c86a11484f47cd11e0c704be72842afd61e0b0bf42cec924d2b4b3e4737' 
  AND token = 'OdASDNKj2rLUHbEHzTCR9//+Lg4qhXbTK2pS6ChStro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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