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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c18e1e74a6f70c75676ac68830eeac17a4c52ab3dfd2ff7465a315c66bfba2c' 
  AND token = 'zx1rWVebTVWVgFSog1mlxXMc6HprBZU4O7NOQmLe6NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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