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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6212240de5a266b8726ae38535750220848048c7af507c812e147eecb8b3b28e' 
  AND token = '2ejXQFLfPQxwsSHWV3GmF4saJfo9242H00K9xIy2gRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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