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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ba08364cdb43be2e7f82f36e8537fe3b9fbfb68f50e2fc1bc3df61980b7bb78' 
  AND token = 'nWFKBsLhYQR2CdMG2t61azWzLWLI2wByULNBLOsgB68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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