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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b87fa5b0cd98b28612090d3e423b1be2ff44c7ee69aea50af8a38bd7d55c1013' 
  AND token = 'eh0Sdk67FLwEFSvsEYSWulDvgpKFTfLRk/puVoX1jEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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