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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39d18dded5d381c6199fdd6063e274b1ac236ca70e990e8fcc8e4bd6bc4eb6c9' 
  AND token = 'WTX36hVMLXDVpDD8P16f6h+URLvYVGQUkPdx4yQVb6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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