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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bea62bdf9e126929b1dd803003768e7493b1a321e4d2ad4d99787a1a87460c42' 
  AND token = '48Z8huNJ1ausL5XehBPbYThKebzj2aW4UphOUaNpdr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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