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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ccc408e2f43a3dec86f5ca93bfffc1013f0608c8383ee8c5de457eb5e4a9fdc' 
  AND token = 'xK9ollHmOYbxgxwEdcW+4FTN1UwYLsRhyFZ9a7qgenM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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