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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5543fef40e4ad907a11add1046b24bca42d36efc30acbbc38f66867142752f94' 
  AND token = '9lmxcnCvNl/bWXEaawBsdm7JBWBrF2TfYET8bf73qy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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