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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '83da0d369622c51d35b1a7e8fbf207b9af6c533362d66e6e5da739266345bda9' 
  AND token = 'FuuRkU7O8yXn0S30NDKopKlDl05RHxzuf8YwCtm1C5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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