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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3dc7972a5114da8c38196f8ca2d13acdcfb7ebccf7a531e3f88a8532aa1318f0' 
  AND token = 'M/JBZBLbe8xQoUDMWpxo4kImgvxtP4ADI7SjAnFJagQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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