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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7990e023e7f50f9cd9e515080b11e36175f2a25b1fe7dab3d83e6e9dc43c5816' 
  AND token = '4mFotQbzoaaSkCbJCi5NlAIU/73ruVTPAMofovMI3iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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