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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '897cf43c73fee9fc037c5549fb5ab6f8d02c64ee371ab5ea8556dea693d367aa' 
  AND token = 'lqOb9oxltQsU1gYdbglGpaLJMHHGMIDvqyYqlv7ISdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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