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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb667b99aefffa813fcbc9b0f7a3c4257d5c423850b3a7628635194ee291c1eb' 
  AND token = '5EzH2VCthen+M+r2Hdus7zKe+3xeMiImd5M4pfZeJa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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