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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dcd93bed14b7e5d118739ca3b7746cb805eac413521232a5a5c3e59d5ff64ca1' 
  AND token = 'gMFNmQhxbFh5VbrFECW5itTx5c55cBOtUyRv8RXMveo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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