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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0ff04b916cb9801c67785c1815abc031523ed803016df00d17f6288fff2ea574' 
  AND token = 'xlCAHiWJ5sw+blLbYF3yV6OaRk3tx2Nk03jPe9kXBWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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