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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '44face284b097dd6c8a70b08507d87bc70acd1bfd962a9ebf8bc318ec6464e4b' 
  AND token = '1b7B89exbDxaJ+LRnRSUApIX2JxfBH0kOUDdHgZ3tZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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