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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e9305fd1f5eebb1ec125deaa436c05604fb882522a0aceb77a29e66a37cde16' 
  AND token = 'fonUmnAuoRz47Ri8XlzLK8o+cOupI03ZLQ4NucGe6Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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