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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '971b7b6c5c56d88debfad2f8238dec5dda1c38892a3823d60569cc3f9d360c19' 
  AND token = 'ltyDkTb1COtRT7BuxL1ug5zhgqdTnfp71nQfefgehCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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