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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70f7a7679932da090c95ef90dc7da9ceb3de293b15d91a03dc93020ae7eeda60' 
  AND token = 'JLbqNN/escnANSCCWD2oTt4RauUm2BGIsjw2OmgGdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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