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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '847cd1daca48797aca359a8c1cb12d0bcbae21032566b76947afd872bab0b4b1' 
  AND token = '3xMLA8gq4roYVyzrVJxLLec5kuamEzBW7bSMxzWjL4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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