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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d9b1d9de2ca623817264e2f3b61a5d11e4e0fb7f6ce34170407b03c1c8eb1c6' 
  AND token = '+KA9ryEPDZ1zly1irA7rHtkIrBlAyYSQePVD036NLew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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