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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '57a23b4f675cb46924bca277079a5cc4b4f21c0ac4661b9be896e2d07e14ae06' 
  AND token = '1a2666VuV88N5c4SLn2092LdeaHyYo2nhUW98Z8Ng0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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