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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fefdf8d5b032ba7a54a3fc122e1abcc46c720a55176e63dabe744547ca5e508' 
  AND token = 'v43jG5KJ4IQwXELyAhT/J4L4/aaiTvE0vBYUoxJGKDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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