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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf43722bbc0a3ea416b78d5f8f74f05c8be89aef81d0d59ce9762f255ae24b25' 
  AND token = '8Nx9FmlWzUxa6lab5uLKT0Q9w2iqyqPYXK9LCbjpeP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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