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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b70bf5263a2a34ca4842864cab87cdb1d7f54aec3e786f49d33f97f38d90b0d' 
  AND token = 'VH3QjXItyoq5LyHgR4JtIvL09cQ4wIEFPaXMrlTbmxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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