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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f891065206f3e4a13f100c24f0e75c87c679195a02ba0c85f58a2d45164b8b43' 
  AND token = 'X97193WR33IejoVH6+V2JpBwmQ6OZElIMe3+N691aUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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