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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4b24b330b6637ecd5e07ea8c0347da4054f8244edf5523f973bd322bd32e4bc6' 
  AND token = 'ky9o2sk4lLiXCMUEPUE3pXA0H12YDF6dkQTA8Bva0Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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