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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fbdd8e408961d88738420d334b23fef90b60970abfcc7e7b930fb95062c6e6b1' 
  AND token = 'eYYFR/s3YlkDQqp9QofliuI0ta1XhRt3egRkd0seisM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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