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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d44d6d35876957f5fc7402264499dd94a6d6d0c6144622f1dcc186c023d3e73' 
  AND token = 't9GdER2c/0rwZm2yL3YNQN/1Eg4sKj6+1dvdRSU1uwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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