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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3819db1048da3068533fa19884d3dcd011f4730306709a84271ad79e64b49cb' 
  AND token = '4eIxjpEIiMMjNIv17BA5GWXHxjUAqoBMTbIDpqyoIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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