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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0003c2877235a1f357b5f4457e538dbf314d5897ec86e7cb990b7e8a578d46fb' 
  AND token = 'op0bAJiENO0axEBgW93L3d1MpRRNUyZWfgjtW3jao94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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