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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c6ecf47a7e7623cb78d8fc28819c5d198a11aed9f62026824a37388df742f68b' 
  AND token = 'xRprLxfIR5RUVEsJ0A8zdFsB5R+CUJuM1wgU0eSWpJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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