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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a6ffbecae98c34641449f0ba0f083f213e6ceed06fc6519a9bc83d764d00cb5' 
  AND token = 'i5PZcR7/5KPhoPF2ecQ618QCEBFu8LRwTuI0hlKjq7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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