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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81186f2be71d6d1d92ee1ebe59c91d27d3568928d2483814599da2014ce7ff18' 
  AND token = 'jwSyxFTH2EQRr2dWqtxC/ST3ZJWCjBG4qOF9SUyb8AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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