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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a006d75725b4b2c6574bf3d7eb508b5c89f35e16c4a9c9b30b736372a205f5f' 
  AND token = 'zXnSArLL5lvscPOX4d5PuvHVbRnGTSizliDyqXf9edc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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