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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd3133fe15f5cede40ac4c7a8cdc5a390818839577a63a13135d9bcf64435280b' 
  AND token = '0q/SpKlHa+R6oYQ8JR+1Yiu3LoD1B/AZ3Gy2W/eJZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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