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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16edf74b24b73879a6b1dc4cc705f8228af36df056f099cecc586d8f8d421dc1' 
  AND token = 'kCUkHT1zWIF/1Ylc3PXORPSo/0nkacAQhM9end7we8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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