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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6573103b97497f7ef034b5c04b1bd8debccacb5ca76b08ef9a9b3e9eea041dee' 
  AND token = 'LBsE4UVnEElV1ATkL/BpN425+DKD+Cm+CIjjKCzBE94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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