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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28d0079c6d64e92d96b235093bdad023c2f1cbfc1c0e93dd22fca5d40c7fe7b2' 
  AND token = '5pt0q6dDYPafmzaXhF3b45p6mVqMV2lmzF5b8aA8Qn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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