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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9db4c8511916a31c8c2bbce70e44d260ac266e48dcdb5a62a995eac69832988' 
  AND token = 'naJGo9YQOvNzV2Wgsak6I8fmI5nazigrahScHiGgW2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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