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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f53ec26255feb8c7163d3ed70e8c867caa67bde3ae9a8cc6526f6ea68be63b41' 
  AND token = '/40lPLwQOHczRpaIDMajVFB/s13SqlP1JDg+HAztWnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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