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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e045d0d038dc31bc3599601b87da21361b21f72aa6f5b88c2806d2599a688f5c' 
  AND token = 't2XusLRCL1OlDZ0a3YqFYjp1EYKnALXyc0I+DO1B6e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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