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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '356b4de585952399db4aeebeec4d65401eb85205ac1e9de13d736cceca3b4cf3' 
  AND token = 'SiNiIoutNvCXez9eD5I5ASIv5PLq+oBfCNTe4nWKDqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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