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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7fac0cecf0c878613a223c1ab4fe3526a36743e5189a4f6e4a7eeccad415c4e' 
  AND token = '9MAztCN6YPiOwddebqo4YB5LJX97btoI1XrLyhmKNIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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